[
https://issues.apache.org/jira/browse/BEAM-10925?focusedWorklogId=532755&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-532755
]
ASF GitHub Bot logged work on BEAM-10925:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Jan/21 23:03
Start Date: 07/Jan/21 23:03
Worklog Time Spent: 10m
Work Description: amaliujia commented on a change in pull request #13629:
URL: https://github.com/apache/beam/pull/13629#discussion_r553643810
##########
File path:
sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/JavaUdfLoader.java
##########
@@ -0,0 +1,206 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.extensions.sql.impl;
+
+import com.google.auto.value.AutoValue;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.channels.ReadableByteChannel;
+import java.nio.channels.WritableByteChannel;
+import java.nio.file.ProviderNotFoundException;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.ServiceLoader;
+import org.apache.beam.sdk.extensions.sql.udf.ScalarFn;
+import org.apache.beam.sdk.extensions.sql.udf.UdfProvider;
+import org.apache.beam.sdk.io.FileSystems;
+import org.apache.beam.sdk.io.fs.ResourceId;
+import org.apache.beam.sdk.util.common.ReflectHelpers;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.commons.codec.digest.DigestUtils;
+import
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.annotations.VisibleForTesting;
+import
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions;
+import
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableList;
+import
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableMap;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.io.ByteStreams;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Loads {@link UdfProvider} implementations from user-provided jars.
+ *
+ * <p>All UDFs are loaded and cached for each jar to mitigate IO costs.
+ */
+public class JavaUdfLoader {
+ private static final Logger LOG =
LoggerFactory.getLogger(JavaUdfLoader.class);
+
+ /**
+ * Maps the external jar location to the functions the jar defines. Static
so it can persist
+ * across multiple SQL transforms.
+ */
+ private static final Map<String, FunctionDefinitions> cache = new
HashMap<>();
+
+ private static final ClassLoader originalClassLoader =
ReflectHelpers.findClassLoader();
+
+ /**
+ * Load a user-defined scalar function from the specified jar.
+ *
+ * <p><strong>WARNING</strong>: The first time a jar is loaded, it is added
to the thread's
+ * context {@link ClassLoader} so that the jar can be staged by the runner.
+ */
+ public ScalarFn loadScalarFunction(List<String> functionPath, String
jarPath) {
+ String functionFullName = String.join(".", functionPath);
+ try {
+ FunctionDefinitions functionDefinitions = loadJar(jarPath);
+ if (!functionDefinitions.scalarFunctions().containsKey(functionPath)) {
+ throw new IllegalArgumentException(
+ String.format(
+ "No implementation of scalar function %s found in %s.%n"
+ + " 1. Create a class implementing %s and annotate it with
@AutoService(%s.class).%n"
+ + " 2. Add function %s to the class's
userDefinedScalarFunctions implementation.",
+ functionFullName,
+ jarPath,
+ UdfProvider.class.getSimpleName(),
+ UdfProvider.class.getSimpleName(),
+ functionFullName));
+ }
+ return functionDefinitions.scalarFunctions().get(functionPath);
+ } catch (IOException e) {
+ throw new RuntimeException(
+ String.format(
+ "Failed to load user-defined scalar function %s from %s",
functionFullName, jarPath),
+ e);
+ }
+ }
+
+ /**
+ * Creates a temporary local copy of the file at {@code inputPath}, and
returns a handle to the
+ * local copy.
+ */
+ private File downloadFile(String inputPath, String mimeType) throws
IOException {
+ Preconditions.checkArgument(!inputPath.isEmpty(), "Path cannot be empty.");
+ ResourceId inputResource = FileSystems.matchNewResource(inputPath, false
/* is directory */);
+ try (ReadableByteChannel inputChannel = FileSystems.open(inputResource)) {
+ File outputFile = File.createTempFile("sql-udf-",
inputResource.getFilename());
+ ResourceId outputResource =
+ FileSystems.matchNewResource(outputFile.getAbsolutePath(), false /*
is directory */);
+ try (WritableByteChannel outputChannel =
FileSystems.create(outputResource, mimeType)) {
+ ByteStreams.copy(inputChannel, outputChannel);
+ }
+ // Compute and log checksum.
+ try (InputStream inputStream = new FileInputStream(outputFile)) {
+ LOG.info(
+ "Copied {} to {} with md5 hash {}.",
+ inputPath,
+ outputFile.getAbsolutePath(),
+ DigestUtils.md5Hex(inputStream));
+ }
+ return outputFile;
+ }
+ }
+
+ private ClassLoader createAndSetClassLoader(String inputJarPath) throws
IOException {
+ File tmpJar = downloadFile(inputJarPath, "application/java-archive");
+ // Set the thread's context class loader so that the jar can be staged by
the runner.
+ Thread.currentThread()
+ .setContextClassLoader(
Review comment:
I think the third option is the one that easy to implement and without
obvious harms.
I think the third option says to specify a known directory on the launcher
VM (so not on workers).
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Issue Time Tracking
-------------------
Worklog Id: (was: 532755)
Time Spent: 28h 50m (was: 28h 40m)
> ZetaSQL: Support Java UDF
> -------------------------
>
> Key: BEAM-10925
> URL: https://issues.apache.org/jira/browse/BEAM-10925
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql-zetasql
> Reporter: Kyle Weaver
> Assignee: Kyle Weaver
> Priority: P2
> Time Spent: 28h 50m
> Remaining Estimate: 0h
>
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